Ving, I have the 20mm and I’m very happy with it. I posted this on the other forum don't know if you saw it. Just my thoughts and I still haven't had a chance to use it in the Meade Sct yet.
(I used my 20mm GSO Superview in the 12" Dob on M42 and Machholz the other night and I must say for a cheaper Ep I was very impressed, the eye relief is my only concern it's only just long enough for me. The 15mm has less eye relief than the 20mm so I won't be going down that track. There was some distortion in the outer 20% of the image but not to bad as to spoil the view. I really can't wait to try this Ep in the f/10 Sct.)
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